Light bar preventer in looms



.1. DESROSIERS LIGHT BAR PREVENTER IN LOOMS Filed Feb. 24, 1956 5 Sheets-Sheet l I 2 34 1 49 4a 8 g 34 37 ll Q FIGURE 2 E I l l INVENTOR J. DESROSIERS Oct. 19, 1937.

FIGURE 4 FIGURE 13 &

J. DESROSIERS LIGHT BAR PREVENTER IN LOOMS Filed Feb. 24, 1936 3 Sheets-Sheet 2 FIGURE 6 FIGURE 5 INVENTOR J DESROSIERS Oct. 19, 1937. J. DESROSIERS 2,096,091

LIGHT BAR PREVENTER IN LOOMS Filed Feb. 24, 1936 3 Sheets-Sheet 3 FIGURE 9 F'GURE INVENTOR J. DESPOSIERS u 1 FIGURE 12 A fro/mm Patented Oct. 19, 1937 UNITED/STATES PATENT oFFicE 3 Claims.

My invention relates to looms such as used in textile mills and is an improvement thereon. The main object of my inventionis to pro- ;vide means whereby'certain defectsin the product of the loomjand knownin the trade as light bars, may be quickly and efficiently detected and the loom automaticallystopped, thereby avoiding Waste of time and material.

Another object is to provide such means workable in combination with the mechanism of the loom intended to stop the same when a break occurs in the warp, known as the drop-wire mechanism, thereby removing the necessity of separate knock-01f mechanism for the detector. This will remove the necessity of additional parts to the already intricate mechanism of the loom.

Other objects reside in the construction of a detector capable of being easily dismantled, and having flexibility,- so as to avoid damage when accidentally coming in contact with any moving part of the loom. i 7

Further objects will appear in the description of the preferred embodiment of my invention as shown in the drawings appended hereto.

As already mentioned, my invention is principally for the purpose of detecting light bars, understood to anyone in the trade to mean the unprovided for space between threads lying cross wise of the fabric due to many reasons, such as, failure on the part of the shuttles, improper functioning of the lay.

For some years looms have been provided with means to detect broken threads in the warp and .to stop the loom immediately on the detection. This means comprises a series, of oscillating bars positioned under the warp and straddled by dropwires supported by warp threads, there being one drop-wire for each thread arranged in such a manner that, in the event of a thread breaking, its respective drop-wire will fall and clamp one of the oscillating bars so as to prevent its move- ,ment, thereby knocking-off a clutch in the driving mechanism. a

In my device, I provide a weight held by an arm or beam over the fabric at a point near the layor rather thereed thereof on its inner stroke. The weight or head, as it may rightfully be called, rests on the fabric through-the intermediaryvof a stylus varying in size according to the mesh produced by the loom, but large enonghto be carried-thereby unless thestylu's meets alight bar when it will dropthrough. A small plunger in the-head will-be lifted inthe latters fall by contact with thefabric and will release a lead connecting with a modified dropwire which will ing the ,adjustmentmeans thereof;

thereby fall and 'clamp one of the oscillating bars and operate the conventional knock-off mechanism so as to immediately arrest the motion of theloom. .Of vcourse, were a loom drop-wire knock-off system or, if desired, in any case my device may operate a separate knock-off mechanism or operate both, or again any auxiliary means of arresting further operation of the loom after a light bar'has been detected.

In the drawings,

Figure 1 is atop plan view of thecomplete detector constructed in accordance with my inven- .tion as installed on the breastbeam of a loom and i as lying over a strip of the fabric, as shown;

Figure 2 is an enlarged view of the head thereof with portion cut away to show its'internal parts in released aspect; r

Figure 3 is an enlarged longitudinal section ofthehead;

relative position with the fabric, warp and loom;

Figure 5 is a view showing a drop-wire in combination with partof the conventional'drop-wire not equipped with the z showing the modified drop wire inoperative position a Figure"? is an enlarged sectional elevation of the upper part of the modified'droprwire, show- Figure ,8 is a top viewof part of the device showing the emergency articulation ofiits mountin r Figure ,9 is an end view 7 Figure 10.is altop viewef the deviceishowing parts as-they appear in released position;

of ,the device as i from the frontofthe loom; a

Figurell is anflenlarged fragmentary viewer two parts, of '.the device showing their separable articulation; r I .FigurelZis an enlarged underside viewof the hinge part (of the device showing the detail thereof;

-Figure 13 ,is a .sectional yiew taken on line 13-43 of Figure 1 showing fragments of several ,parts ,pivotedtogether. a

Similarsymbols of reference'denoteidentical parts in all the figures;

Referring to ,Figures :1 and 4, I5 denotesia portion of the.breastbea n'ofialoomi in-the'preseritf J ease, the right-hand side .jhereof, over which passesflthe finishedproduct, part of which is. denoted by Hi, having its selvedge llwhere shown; The ,ferwardposition, of the reedof the lay is V v 20 Figure ,4 is a side view of the devicelshowing its indicated by double dotted lines l8 and partof the warp by IS. The above parts or portions of parts are, of course, merely shown as an aid in illustrating my device in order to show its approximate position on the loom and, as such, are not shown or explained in detail. 7

On breast beam I 5, or any suitable loom member as theindividual looms may govern, is fastened a slide base by means of bolts or screws 2|, one being at each end. thereof. Slidably mounted thereover, but adapted to be set in position by means of a bolt 22 passing between it and base 20, is a foot 23, having an extension 24 provided with a vertical post 25. 'Resting on the extension and pivotally mounted around the post 25, by means of its sleeve 26, is an arm 21 normally lying in the same direction as extension 24.

, Arm 21 is held in its normal position by means of a spring 28 shaped as shown coiled around a pintle 29 on foot 23, one end resting against a pin 38, also on foot 23. The other end of the spring rests in a small saddle 3l extending-down- Wardly from the'arm '21, whichittends to press against the side of extension 24; Mounted at the end of arm 21, at right angle thereto and pointing towards the rear of the loom, is a hinge member 32 in which is pivoted one end of a beam 33, so that the latter may be free to function vertically. The other end of the beam terminates in an integral head 34 provided with acap piece 35 held to the head by means of a' screw"36 pass- 'ing through the former and threaded in the latter as shown in Figures 2 and 3. Towards the extremeend of the head, a stylus 31 is mounted in a perforation which is enlarged at the upper edge thereof in order to receive the enlarged portion 38 of the stylus.

This construction is intended to prevent the stylus from falling off and to allow the same to be removable. It is held in place by the cap 35. It will be seen that the stylus is set at an angle so that its lower end will be substantially in a perpendicular plane with the end of the head.

- Substantially centralof the head is a vertical bore 1 downward pin 42.

39 inwhich is mounted a plunger 40 provided with an integral toppiece 4| extending towards the rear of the 'head where it is provided with a Plunger 40 and pin 42 are loosely fitted in their respective bores so that they fall by their own weight until their joining piece 4i rests on top of head42. In this position it will beseen that the plunger extends below the head, though for a shorter distance than does the stylus. In the same position, the angular portion of pin 42 crosses a horizontal slit 43 substan-v tially in line withv the top of the beam. Beam 33 is made in two parts, one lying over the other and held together by bolts 44 fastened through slits in each part so that the beam may be *lengthened or shortened as desired.

. L n overbeam 33 are two thin. strap like "members 45 and 46, having alongitudinal slit for the best part of their length. Members 45 and 46 overlap each other and are joined together by means of atboltjll'l forming an adjustable link 48;

The. rear end of link 48 is adapted to enter slit 43 inthe head andjis guided therein by means of a small post 49 mounted on. beam33. Theother end of the 'linkis provided with a post 50 adapted to engage theiarcuate slit 5| in sector 52 of a lever 53. It will be seen in Fig- 'ure 3 that, when link 48'is inserted fully in slit Q43, it becomes engaged by ,pin 42 as the latter "drops in the'linl; and-that, when'it is free as in a 60 which, in turn, rests on the arm. 7

' spring 60 adjustable by nut 59;

to theaction of spring 28 Figure 2,, the links travel is limited by post 49. Lever 53 is provided with a vertical sleeve 54 adapted to surround sleeve 26 of arm 21 and is thereby fulcrumed at that point. This constructural detail is clearly shown in Figure 13..

It has been previously mentioned that beam 33 is hinged to a piece or member 32 mounted on arm 2'1, but, although normally at right angle, the mounting means are yieldable. The hinged piece is provided with bars denoted by numerals 55 in Figure'12 fastened to its underside. These bars are semi-cylindrical and engage with corresponding grooves in arm 21. The hinged piece is held firm to the arm by means.

The lower end of the bolt'passes through an, opening in arm 21 and is provided with vertically disposed,

lugs 51 which lie on .the underside face of the arm when the beam is-atairightanglethereto.

Howeven'when the beam isin straight line-with r x the arm, the lugs register with two notches- 58.

The'bolt is held by nut 59v pressing on a spring With this construction it will be seen that the beam may be shifted eitherone way or the other from its normal position, since link 48 is free to ride at its inner end in sector .52; the 're-,

sistance against the free shifting of the beam.

depends on the amount of pressure exerted by 7 It is evident that the beam and head may be readily removed from its support without disturbing the support nor its adjustment, by simply moving the beam until the link is disengaged with sector 52 and then until the bolt freesitself through notches 58. The manner of assembly of the beam with its support is self-evident. The function of sector 52' in relation to post 5011s also evidentin Figure 8. q

This construction permits the detector to ashead and beam may be withdrawn or forcedback from their normal position without disturbing the angle with respect to the fabric and yet; will return to its normal position when released,- due 'sume the aspect shown inFigure 8 in that the Referring to Figure 5, numerals 6| denote frame bars of a loom separating banks ofv drop-- wires, one of which is denoted by 62, and over which pass warp threads from warproller 63. One thread 64 is shown supporting drop-Wire 62 by passing through its eye 65 and resting over frame bar 66. From that point the thread proceeds to'the healds and reed (notshown) until it reaches the position as shown at 19pm Figure 1. v

Numerals 6] denote the oscillating bars which normally are in motion when the loom' is in operation, but which operate a knock-01f mechanism to stop the operation of the loom when their motion is arrested. 'When a thread breaks its drop-wire' falls down, the narrow portion- 68 of which straddles its respective bar 61,01) viously stopping the loom. By means ,of a Wire ;or thread 69,; as desired, leading-from asmall; hook 19 fastened to the end of lever 53, leading to the reariof the loom and passing over .a small grooved pulley H, a modified drop-wire I2 is supported in the same relative position with respect to, the oscillating bars as are the conventional drop-wires. Drop-wire 12, however, is of greater weight than warp drop-wires and is of the open'form'typa'so that it may easily be re- 'moved from bar 61, which it straddles, in order to prevent any interference therewith when the loom is being threaded or attended to.

Guiding pulley H is mounted on a bracket 13 which is in two parts, so as to be adjustable vertically as shown, its lower part being adapted to surround frame bars 66 where it is fixed by a set-screw l4. Bracket 13 is positioned outside the warp so as not to interfere with same, and for the same reason to support drop-wire" beyond the regular drop-wires, in the present case on the right-hand side thereof. Pulley 'H is adjustable longitudinally of the loom so that drop-wire 12 may be guided in its exact 'required position with respect to bar 61.

Wire or thread 69 passes through the reed on its way to support 13 and any undue play thereof is taken up by means shown in Figure '7. This means consists of a small shaft 15 mounted in the top of drop-wire 12 crossing an opening 16. It is provided with a small hole so that the thread or wire 69, after passing in small bore 11, may be tied to same. a knob 18 so that, by turning the same, thread 59 may be either coiled on or uneoiled from the shaft for adjustment. The shaft is held in fixed position by the pressure of spring 19, pressing on knob 18 as shown. It will be noted that dropwire 12 has a narrowed portion corresponding to that in drop-wires 62.

In use the detector is mounted, as described, on the loom and a thread or wire, denoted by numeral 69, is tied between hook 11] on the detector lever and, after passing through reed and over pulley H, is tied to shaft 15 of the modified drop-Wire 12.

Thread 69 should be of a length which will hold its drop-wire approximately at the same level as other drop-wires on the loom. Proceeding with link 48, engaged as in Figure 3 by 111142, which is the result of pushing the link against the angular end of the pin, whereby it will be lifted and allowed to fall in the link, the exact required height of drop-wire 12 is obtained by manipulation of its knob 18. Assuming that the device is resting on a piece of cloth, represented by line N5, of a mesh which will support stylus 31, which has been selected of the proper size therefor, it will be held as in Figure 3, line l6 representing the cloth. However, should a light bar occur, by the failure of the loom as shown at 8|, Figure 1, the stylus will drop through,- followed by head 34, resulting in the position shown in Figure 2. It will be seen that, in the fall, plunger 40 has come in contact with the cloth and was lifted, carrying with it pin 42, thereby releasing link 48. In turn, lever 53 was allowed to swing to the angle shown in Figure 10, paying off thread or wire 69 thereby allowing drop-wire 12 to fall and engage oscillating bar 61 over which it hung as shown in Figure 6. will, for reasons already explained, operate to stop the loom. If desired a signal may be operated in connection with the detector.

Shaft 15 is provided with After detection of the flaw and its remedy, the detector may again be placed in working form by the simple manual reengagement of link 48 with pin 42, which will obviously lift dropwire 12 and relieve the knock-off mechanism of the loom.

The head may be arranged in sections or other wise so that it may be made heavier or lighter as would be governed by the density of the material being woven and, further, the stylus will have a tip of a form best adapted todetect the flaw, its form varying with the shape of the opening in the mesh.

While I have described my invention strictly in accordance with the embodiment shown, it

must be understood that changes may be made in the construction of the device in order to suit various looms and to adapt the detector to Varying conditions in the trade, without departing from the spirit of my invention and scope of my claims.

What I claim is: g 1. A light bar detector for looms having knockoff mechanism, comprising a support mounted on said loom, a'beam hinged at one end of said support to permit vertical motion thereof, a head at the other end of said beam, a stylus on said head resting on the fabric on said loom, a leverfulcrumed on said support, a link extending from said head to one end of said lever, means in said head to normally engage said link, means in connection with the other end of said lever connecting with said knock-off mechanism, said engaging means adapted to release said link when coming in contact with said fabric.

2. In combination with a fabric producing loom, having knock-off mechanism; a support on said loom, a pivot on said support, an arm mounted at one end on said pivot and resiliently held in one a position with reference thereto, a beam pivoted at one end to the other end of said arm, means to resiliently hold said beam over the fabric substantially at right angle thereto, a head at the other end of said beam, a stylus on said head to support the same on said fabric, a plunger in said head over said fabric, said plunger adapted to be raised by contact with the fabric in said head when said stylus falls in a light bar in said fabric, and means cooperating with the knock-off mechanism whereby the raising of said plunger will I actuate the same.

3. In combination with a fabric producing loom having knock-off mechanism; a beam supported on said loom at one end, a head at the other end of said beam having a stylus to support the same on the fabric, a plunger positioned in a bore in said head, a downward pin dependent on said plunger, a link normally in engagement with said pin connecting with said knock-off mechanism, said head adapted to drop when its stylus meets a defect in said fabric thereby raising said plunger by contact with the fabric and releasing said knock-off mechanism. a

JOHN DESROSIERS. 

